This screen applies to DOCSIS 1.0 and DOCSIS 1.0+ modems only and is used to provision the number of phone lines/voice ports for the modem. The following information is entered by the user to describe the vendor identification, vendor-specific information, Cisco IOS filename, number of phone lines, and IP precedence.
The three-byte Organization Unique Identifier for the vendor, which is also usually the first three bytes of the modem's MAC address. This value is usually expressed as a hexadecimal number. The default value is "00.00.00." For Cisco Systems, this field should be "00.00.0C." When the vendor ID is used outside the vendor-specific information field (VSIF) in the configuration file, this field should be the vendor ID of the sender.
Example: 00.00.0C
For a list of Cisco's and Cisco partner's Vendor IDs, see Specify Vendor-Specific Information (Cable) in the Configuration File.
Contains any arbitrary values defined by the manufacturer of the modem. The Cisco uBR924 cable modem uses this field to identify the Cisco IOS configuration file (if any) that should be downloaded.
If present, this information MUST be encoded in the vendor-specific information field (VSIF) (code 43) using the Vendor Specific Info field to specify which Type, Length, Value (TLV) applies to which vendor's products. The vendor ID MUST be the first TLV embedded inside the VSIF. If the first TLV inside the VSIF is not a vendor ID, the TLV is discarded. This configuration setting and vendor ID can appear multiple times. However, there MUST NOT be more than one vendor ID TLV inside a single VSIF.
Each vendor-specific information entry MUST be separated by a <Return>.
Example: The TLV for encoding an IOS configuration file named ios.cnf is:
128.7.105.111.115.46.99.110.102
Where "128" is the Type, "7" is the length of the filename, and the rest of the number string is the ASCII representation of the filename, "ios.cnf."
For a list of vendor-specific sub-fields currently supported in the Cisco cable modem reference design, see Specify Vendor-Specific Information (Cable) in the Configuration File.
This vendor-specific option allows the modem to download the named Cisco IOS configuration filename from the TFTP server as part of the registration process.
Example: ios.cfg
Within DOCSIS 1.0+, a special vendor-specific encoding allows you to set the number of phone lines. For the Cisco uBR924 cable modem, this value could be 0, 1, or 2. Where "0" represents data-only, no voice ports; "1" and "2" represent the number of phone lines/voice ports available on this Cisco vendor-specific modem. For other DOCSIS 1.0+ modems, the maximum number of phone lines could be "4."
Example: 2
Within DOCSIS 1.0+, the IP precedence settings are used for separating voice/signaling from data. In the case of a call where one endpoint is outside the cable network, it is the responsibility of the "outside" network to ensure that all voice packets are colored appropriately before forwarding them to the CMTS. In case of a call where both endpoints are on the network, it is the responsibility of the endpoint (customer) originating the traffic to do the special coloring of voice packets as compared to data before launching packets into the network.
IP precedence has a traditional structure in a major ISP network. Priorities 5, 6, and 7 are generally reserved for network management traffic. DOCSIS class of service (CoS) priorities 0 to 7 can be used by the operator, that could directly map to IP priorities 0 to 4 (with 5 to 7 reserved).
Example: Value = 4; Rate Limit (kps) = 128000
In this example, the voice-transport precedence value (4) is set to a downstream rate limit of 128 Kbps.
Set Up Vendor-Specific Information Field
Specify Vendor-Specific Information (Cisco) in the Configuration File